Seasonal Variations of Glucose and Triiodothyronine Concentrations in Serum of Carp (Cyprinus Carpio L)

D. Stryjek-Kaminska; U. Loos; V. Maier; H. H. Ditschuneit; E. F. Pfeiffer

doi:10.1055/s-2007-1010932

Hormone and Metabolic Research, Table of Contents

Horm Metab Res 1988; 20(12): 727-729
DOI: 10.1055/s-2007-1010932

ORIGINALS

Basic
© Georg Thieme Verlag, Stuttgart · New York

Seasonal Variations of Glucose and Triiodothyronine Concentrations in Serum of Carp (Cyprinus Carpio L)

D. Stryjek-Kaminska¹ , U. Loos¹ , V. Maier¹ , H. H. Ditschuneit² , E. F. Pfeiffer¹

¹Medizinische Klinik und Poliklinik der Universität Ulm, Abteilung Innere Medizin I, Ulm, Germany
²Medizinische Klinik und Poliklinik der Universität Ulm, Abteilung Innere Medizin II, Ulm, Germany

Abstract

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Summary

Thyroid hormone and glucose serum concentrations (SC) of carps (Cyprinus carpio L) have been monitored at weekly intervals throughout the year. T₄ and rT₃ concentrations were always below the limit of detection of the assays applied. T₃ and glucose mean SC showed seasonal variations. Highest T₃ SC were reached in summer with a peak value in August and lowest values in winter with a maximum in December. Glucose SC have been found to be highest in winter and lowest in summer. Statistical analysis showed a negative correlation between T₃ and serum glucose SC (r=-0.77, P < 0.001). The seasonal dependency of T₃ and glucose SC suggest that either temperature, food intake or day-light or both might play a role in the regulation of glucose metabolism as well as of T₃ production or metabolism.

Key-Words

Thyroid Hormones - Glucose Metabolism - Seasonal Variations - Carp

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